I have HP envy 15 Notebook. After the updates my touch screen is not working at all.

I understand that you have an HP Envy 15 series laptop and the touchscreen is no longer working. The touchscreen drivers are absent in the device manager. You've done a remarkable job performing the steps.

Meanwhile, you may download and run the HP Support Assistant tool. This tool wills can your laptop and will install the required drivers. The laptop needs to be restarted after running the HP Support Assistant.

In case the problem persists then install the firmware update for the touchscreen via this link.

This HP document will also help in fixing various touchscreen related issues.

I genuinely hope the issue gets resolved without hassles and the unit works great. Let me know how it goes.

If you have problems or not sure if it the correct HID-compliant Device, just look under the Driver Details and hit the drop down box to scroll through all those different labels until it clearly says "Touchscreen" under "Bus Reported Device Description"

1) Go to Device Manager (Windows Key+X, select it)
2) Under the "Mice and other pointing devices" list find "USB Touchscreen controller", or the driver that's not your mouse/touchpad.
3) Right click to select "Properties", click the "Driver" tab, and click "Roll back".
4) After confirming, this will remove the driver from that list but bring up a bunch of new ones under "Human Interface Devices", where the touchscreen stuff logically should live.
5) Make sure that all the other drivers are updated EXCEPT "USB input device". This is the one that moves it all to the mouse drivers.